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normally one
it is near the thermostat housing and has up to 4 wires attach to the plug
it is used to repot engine coolant temperature to the ECM so that air/fuel mixture can be adjusted and the fans switched on through a relay
don;t confuse it with a coolant temperature sender which has 1 wire and works the temp gauge
ffixkick.com see sensor test page. if the tachometer in dash is dead, then you lost power to the dash. check fuses. if the they failed 1 by one, then maybe they did? there are 2 easy tests to find the cause. coolant http://www.fixkick.com/sensors/tests/Guage-coolant-test.html
That means its not meeting the minimum thermostat regulating temp. Its saying that its not warming up.. If it feels like its as hot as usual. Its probably the temp, sensor.
the mass air flow is part of the throttle body assembly. its where the big air hose from the air filter hooks to on the motor. here is a picture to aid you. hope this helps
the red mark is showig the coolant temp.
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